TGrpButtonEvent is a type of Button Group event handler.
TGrpButtonEvent = procedure (Sender: TObject; Index: Integer) of object;
(Sender: TObject; Index: Integer) ( TGrpButtonEvent)();
TGrpButtonEvent defines the type of method procedure that you must define in order to implement the OnButtonClicked and OnHotButton events.
This event is invoked for a button in the button group.
Sender is a reference to the TButtonGroup invoking the event.
Index is the index of the button in the button group.
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